[android] How to extract list of all apps installed on the device.

If you want to make a launcher, this might be helpful. 

Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); 
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); 

List<ResolveInfo> pkgAppList = getPackageManager().queryIntentActivities(mainIntent, 0);       

Then you have your list in "pkgAppList".